Centrifugal pump



K. O. MJULSNES.

CENTRIFUGAL PUMP.

APPLICATION FILED Nov. I9. Isls.

Patented Jan. 11, 1921.

2 SHEETS-SHEET I.

IIIIIII Kl O. MIOLSNES.

CENTRIFUGAL PUMP. APPLICATION FILED nov. 19, i919.

1,365,006, l Patented Jan. 11, 1921,

2 SHEETS-SHEET 2.

. @gaux if KUNT oLsAN MJoLsNs, or NASHWUKKMINNESOTA. i

CENTRIFUGAL rUMr.

Application filed November 19, 1919. Serial'No. 339,213.

To all whom t may concern: i

Be it known that I, KUNT O. MJoLsNEs, a citizen of the United States,and a resident of Nashwauk, in the county of Itasca and State ofMinnesota, have invented certain new and useful Improvements inCentrifugal lPumps, of which the following is a specification.

My invention is an improvement in centrifugal pumps, and the inventionhas for its object to provide mechanism in connec tion with pumps of thecharacter specified, for permitting the pump to be repaired when itbecomes worn, without requiring eX- tensive operations on the pump,merely by removing the worn portion and substituting a new portion.

In the drawings:

Figure 1 is a top plan View of the casing with the upper half removed,

Fig. 2 is an enlarged detail of the upper end of Fig. 1, p F Fig. 3 is asection on the line 3 3 of ig. 1, f

Fig. 4 is a side view, with parts broken away.

In the present embodiment ofthe invention, the impeller 1 is secured toa shaft 2, which is journaled in bearings in the casing or housing,consisting of the upper section 3fL and the lower section 3. The casingor housing has an annular passage at the periphery of the impeller, thesaid passage gradually increasing in diameter from the intake end 4thereof to the outlet end 5 thereof.

Thrust rings 7 are arranged on the hub 6 of the impeller on each side ofthe same, and the water driven by the pump is taken in through the hubsand discharged by the impeller varies into annularpassage 4-5 to itsfinal discharge. Asis known,the edge of the annular passage becomesworn, after a time depending upon the nature of the liquid handled bythe pump, and the liquid instead of taking the prper course, will eddyabout the pump center. To prevent this, I place resistance plates 8Within the housing to conform to the curves and lines of annular passage4, the impeller, etc.

These plates which are arranged on the opposite sides of the impellerhave their inner ends and sides shaped to it the contour of the hub,thrust rings, and impeller surfaces, as clearly shown in Fig. 1. kTheirK Specification of Letters Patent. Patented Jan; 11, 1921. l i

outer ends are shaped to conform to the contour of annular passage 4,and their outer edges are straight. ranged in rabbets 9 in the housing3, so that their upper faces are flush with the upper face of thehousing section, and they are held in place by screws 10 which arecountersunk in the plates to be flush with the upper face thereof. n v

As shown more clearly in Fig. 2, the plates at their outer ends and attheir inner edges have lugs 11 which extend toward each other, at theperipheraly surface of the` impeller. These plates are formed from flatsheet steel, and will vary inshape to con These plates are ar-` form tothe design of various pumps. They prevent wear, being of resistantmaterial and when worn, they may be easily removed and replaced by newplates. In practice, the

plates need be not more than g to of an inch in thickness. v In theimproved pump the water is draw .in through the inlet 12 to the axis ofthe impeller and is forced outwardly by the rota, tion of thek impellerto the annular passage of the casing 3-3f The rotation of the im pellerand the force of the water coming from behind drives the water aroundthe annular passage and out at thev outlet 13. When the casing B-Babecomes worn the liquid, instead of lling the annular passage to theoutlet 13, will merely eddy, or turn around the impeller hub. The platesremedy this, for they prevent .eddies and churningof the liquid. Thepurpose of the lugs 11 is to more clearly define the annular passage andthe impeller chamber. The plates' 8 act in the same manner as delectors,con straining the liquid to flow outwardly substantially radial to thecasing 3--3a tothe annular passage.

I claim In a centrifugal lpump,the combination with the housing havingthe impeller chamber and the annular passage outside of the impellerchamber and communicating therewith, the impeller in the chamber and theshaft to which it is secured journaled in the housing, of resistanceplates arranged adj acent to the intake end of the annular passage, saidplates being arranged on opposite q sides of the mpeller chamber andbengeX- tended in from the Walls theieof toward the mpellel' and havingtheir inner edges shaped to nt closely up to elle sides of the mpeller,each plate having a lug extending inwardly toward the opposite plate atthe peripheral surface of the mpeller and partially separating and denngthe annular passage from the rnpeller chamber, said plates `beingdetachable for `the purpose 10 specified. p

" KUNT OLSAN MJOLSNES.

